A031442 - cp's OEIS frontend

A031442 a(0) = 13; for n > 0, a(n) is the greatest prime factor of PreviousPrime(a(n-1))*a(n-1)-1 where PreviousPrime(prime(k))=prime(k-1).

n	a(n)
0	13
1	71
2	41
3	379
4	23561
5	5431
6	20269
7	89
8	1231
9	44497
10	329952671
11	36583
12	1126159
13	90209117
14	14095897
15	15272393
16	13887359
17	256460794943
18	2740505805180429880723
19	1591234463080874838018721796071210709

[13, 71, 41, 379, 23561, 5431, 20269, 89, 1231, 44497, 329952671, 36583, 1126159, 90209117, 14095897, 15272393, 13887359, 256460794943, 2740505805180429880723, 1591234463080874838018721796071210709]

cp's OEIS Frontend

A031442 a(0) = 13; for n > 0, a(n) is the greatest prime factor of PreviousPrime(a(n-1))*a(n-1)-1 where PreviousPrime(prime(k))=prime(k-1).

Table of values

List of values